STRUCT AD5421_STATE(9)

✨ struct ad5421_state(9) ✨

okay so bestie, this is a page straight outta the Kernel API Manual — it's all about struct ad5421_state, which is literally the driver instance specific data 🎀. Think of it as the little vibe-holder that keeps track of one specific AD5421 driver instance. iykyk 💅

🌸 NAME 🌸

struct ad5421_state — driver instance specific data 🫶

🦋 SYNOPSIS 🦋

struct ad5421_state {
    struct spi_device               *spi;
    unsigned int                    ctrl;
    enum ad5421_current_range       current_range;
    unsigned int                    fault_mask;
    struct mutex                    lock;
    union {
      __be32 d32;
      u8 d8[4];
    } data[2];
 };

no cap, that's the whole struct. slay. ✨

👑 Members 👑

• spi — the spi_device, bestie. it's giving "who am I talking to" energy 💖
• ctrl — the control register cache. yeah, we're caching it. lowkey iconic 🎀
• current_range — an enum ad5421_current_range, i.e. the current range the device is configured for. highkey important 🔥
• fault_mask — software masking of events. keeping some of that event noise out of your feed, fr fr 🙈
• lock — a struct mutex whose whole job is protecting the data buffer during SPI ops. main character energy for a mutex, honestly 💅
• data — the spi transfer buffers. it's a data[2] array of a union that's either a __be32 d32 or a u8 d8[4]. two buffers, two ways to look at 'em. ate. 🍓

🧚 SEE ALSO 🧚

• Kernel file ./drivers/iio/dac/ad5421.c — go read the source, bestie, it's right there 🌈

and that's the whole page, periodt. this lil gem lives in ./drivers/iio/dac and the version/date stamp is from October 2026 💜 — so like, future vibes only. byeeeee 👑✨🦋